package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.vo.AttrRespVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @program: gulimall
 * @description:
 * @author: 江天赐
 * @create: 2022-08-07 18:44
 */
@Service
public class MallSearchService implements com.atguigu.gulimall.search.service.MallSearchService {

    @Autowired
    private RestHighLevelClient client;
    @Autowired
    ProductFeignService productFeignService;


    /**
     * @param searchParam 检索的所有参数
     * @return 返回检索的结果，里面包含页面所需的所有信息
     */
    @Override
    public SearchResult search(SearchParam searchParam) {
        //动态构建出查询需要的dls语句
        SearchResult result = null;
        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(searchParam);
        try {
            //2.执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            //3.分析响应数据封装出我们需要的格式
            result = buildSearchResult(response, searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam searchParam) {
        SearchResult searchResult = new SearchResult();
        SearchHits hits = response.getHits();//命中的数据
        //1.返回所有查询到的商品
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(searchParam.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    if (skuTitle != null) {
                        String string = skuTitle.getFragments()[0].string();
                        skuEsModel.setSkuTitle(string);
                    }
                }
                esModels.add(skuEsModel);
            }
        }
        searchResult.setProducts(esModels);
        //2.当前商品涉及到的所有属性信息
        List<SearchResult.AttrsVo> attrsVos = new ArrayList<>();
        //先得到嵌入式的聚合
        if (response.getAggregations() != null) {
            ParsedNested attr_agg = response.getAggregations().get("attr_agg");
            ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
            for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
                SearchResult.AttrsVo attrsVo = new SearchResult.AttrsVo();
                //得到属性的id
                long attrId = bucket.getKeyAsNumber().longValue();
                attrsVo.setAttrId(attrId);
                //得到属性的名字
                String attrsName = ((ParsedStringTerms) bucket.getAggregations().get("attrs_name_agg")).getBuckets().get(0).getKeyAsString();
                attrsVo.setAttrName(attrsName);
                //得到属性的所有值
                List<String> attrsValues = ((ParsedStringTerms) bucket.getAggregations().get("attrs_value_agg")).getBuckets().stream().map(it -> {
                    String attrsValue = it.getKeyAsString();
                    return attrsValue;
                }).collect(Collectors.toList());
                attrsVo.setAttrValues(attrsValues);
                attrsVos.add(attrsVo);
            }
            searchResult.setAttrs(attrsVos);


            //3.当前商品涉及到的所有品牌信息
            List<SearchResult.BrandVo> brandVos = new ArrayList<>();
            ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
            for (Terms.Bucket bucket : brand_agg.getBuckets()) {
                SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
                //获取品牌id
                long brandId = bucket.getKeyAsNumber().longValue();
                brandVo.setBrandId(brandId);
                //品牌的名称
                String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
                brandVo.setBrandName(brandName);
                //品牌的图片
                String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
                brandVo.setBrandImg(brandImg);
                brandVos.add(brandVo);
            }
            searchResult.setBrandVos(brandVos);
            //4.当前商品涉及到的所有分类信息
            ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
            List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
            List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
            for (Terms.Bucket bucket : buckets) {
                SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
                //获取出分类id
                String catalogId = bucket.getKeyAsString();
                catalogVo.setCatalogId(Long.parseLong(catalogId));
                ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
                //获取出分类名称
                String catalogName = catalog_name_agg.getBuckets().get(0).getKeyAsString();
                catalogVo.setCatalogName(catalogName);
                catalogVos.add(catalogVo);
            }
            searchResult.setCatalogs(catalogVos);
        }
        //============以上信息从聚合信息中获取===============
        //5.分页信息-页码
        searchResult.setPageNum(searchParam.getPageNum());
        //6.分页信息-总记录数
        long total = hits.getTotalHits().value;
        searchResult.setTotal(hits.getTotalHits().value);
        //6.分页信息-总页码-计算
        int totalPages = (int) (total % EsConstant.PRODUCT_PAGESIZE == 0 ? total / EsConstant.PRODUCT_PAGESIZE : (total / EsConstant.PRODUCT_PAGESIZE) + 1);
        searchResult.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        searchResult.setPageNavs(pageNavs);

        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0) {
            //构建面包屑导航功能
            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr -> {
                //分析每一个attrs传递来的查询参数
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //attr=2_5寸:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                searchResult.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrRespVo data = r.getData("attr", new TypeReference<AttrRespVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //取消了这个面包屑以后，跳转到指定地方，将url替换
                //拿到url中当前的查询条件，去掉当前

                navVoSetLink(searchParam, attr, "attrs", navVo);
                return navVo;
            }).collect(Collectors.toList());
            searchResult.setNavs(collect);
        }
        //品牌，分类
        if (searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0) {
            List<SearchResult.NavVo> navs = searchResult.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO:远程查询所有品牌
            R r = productFeignService.brandInfo(searchParam.getBrandId());
            if (r.getCode() == 0) {
                List<BrandVo> brands = r.getData("brands", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer stringBuffer = new StringBuffer();
                for (BrandVo brand : brands) {
                    stringBuffer.append(stringBuffer + ";");
                    navVoSetLink(searchParam, brand.getBrandId() + "", "brandId", navVo);
                }
                navVo.setNavValue(stringBuffer.toString());
            }
            navs.add(navVo);
        }

        //分类：不需要导航取消
        return searchResult;
    }

    private void navVoSetLink(SearchParam searchParam, String value, String key, SearchResult.NavVo navVo) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+", "%20");//浏览器对空格的编码与java不一致
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (searchParam.get_queryString().contains("&" + key + "=")) {
            String replace = searchParam.get_queryString().replace("&" + key + "=" + encode, "");
            navVo.setLink("http://search.gulimall.com/list.html?" + replace);
        } else if (searchParam.get_queryString().startsWith(key + "=")) {
            String replace = searchParam.get_queryString().replace(key + "=" + encode, "");
            navVo.setLink("http://search.gulimall.com/list.html" + replace);
        }
    }

    /**
     * 准备检索请求
     * #模糊匹配，过滤（按照属性、分类、品牌、价格区间、库存），排序，分页，高亮，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam searchParam) {
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();//构建dsl语句
        /**
         * #模糊匹配，过滤（按照属性、分类、品牌、价格区间、库存）
         */
        //1.构建bool->query
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        BoolQueryBuilder boolQueryBuilder1 = QueryBuilders.boolQuery();

        //1.1 must->模糊匹配  skuTitle中可能不存在keyword,keyword可能是三级分类的名称
        //skuTitle:华为 HUAWEI Mate 30 Pro 翡冷翠 8GB+256GB  keyword:手机 这样导致查不到数据
        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            try {
                boolQueryBuilder1.must(QueryBuilders.matchQuery("skuTitle", searchParam.getKeyword()));
                searchSourceBuilder.query(boolQueryBuilder1);
                SearchResponse response = client.search(new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder), GulimallElasticSearchConfig.COMMON_OPTIONS);
                SearchResult searchResult = buildSearchResult(response, searchParam);
                if (searchResult.getProducts() != null && searchResult.getProducts().size() > 0) {
                    boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle", searchParam.getKeyword()));
                } else {
                    boolQueryBuilder.must(QueryBuilders.matchQuery("catalogName", searchParam.getKeyword()));
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //1.2 bool->filter->按照三级分类id查询
        if (searchParam.getCatalog3Id() != null) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId", searchParam.getCatalog3Id()));
        }
        //1.2 bool->filter->按照品牌id查询
        if (searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0) {
            boolQueryBuilder.filter(QueryBuilders.termsQuery("brandId", searchParam.getBrandId()));
        }
        //1.2 bool->filter->按照所有的属性查询 嵌入式
        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() != 0) {
            for (String attrs : searchParam.getAttrs()) {
                //attrs=1_5寸:8寸&attrs=2_16G:8G
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attrs=1_5寸:8寸
                String[] s = attrs.split("_");
                String attrId = s[0];//attrs=1 检索的属性id
                String[] attrValues = s[1].split(":");//这个属性检索使用的值
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQueryBuilder.filter(nestedQueryBuilder);
            }

        }
        //1.2 bool->filter->按照库存是否有查询
        if (searchParam.getHasStock() != null) {
            boolQueryBuilder.filter(QueryBuilders.termsQuery("hasStock", searchParam.getHasStock() == 1));
        }
        //1.2 bool->filter->按照价格区间是否有查询
        if (!StringUtils.isEmpty(searchParam.getSkuPrice())) {
            //1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = searchParam.getSkuPrice().split("_");
            if (s.length == 2) {
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (searchParam.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if (searchParam.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQueryBuilder.filter(rangeQuery);
        }
        //把以前的所有条件都拿来进行封装
        searchSourceBuilder.query(boolQueryBuilder);
        /**
         * 排序，分页，高亮，聚合分析
         */
        //2.1 sort
        if (!StringUtils.isEmpty(searchParam.getSort())) {
            String sort = searchParam.getSort();
            String[] s = sort.split("_");
            searchSourceBuilder.sort(s[0], s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC);
        }
        //2.2 分页 pageSize 5
        // pageNum:1 from:0 size:5 [0,1,2,3,4]
        //pageNum:2 from:5 size:5
        //from =(pageNum-1)pageSize
        searchSourceBuilder.from((searchParam.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE).size(EsConstant.PRODUCT_PAGESIZE);
        //2.3高亮
        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            searchSourceBuilder.highlighter(highlightBuilder);
        }
        //2.4 聚合分析
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //1.1子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        //TODO:聚合brand_agg
        searchSourceBuilder.aggregation(brand_agg);

        //2分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        //TODO:聚合catalog_agg
        searchSourceBuilder.aggregation(catalog_agg);

        //3.属性聚合 嵌入聚合 attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前所有的attrId attr_id_agg
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合出当前attr_id对应的name attrs_name_agg 一对一
        attr_id_agg.subAggregation(AggregationBuilders.terms("attrs_name_agg").field("attrs.attrName").size(1));
        //聚合出当前attr_id对应的value attrs_value_agg 一对多
        attr_id_agg.subAggregation(AggregationBuilders.terms("attrs_value_agg").field("attrs.attrValue").size(50));

        attr_agg.subAggregation(attr_id_agg);
        //TODO:聚合attr_agg
        searchSourceBuilder.aggregation(attr_agg);


        System.out.println("构建的DSL：" + searchSourceBuilder.toString());
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder);
        return searchRequest;
    }
}
